Foundations - Insert GI pipes of minimum 60 to have foundation depth of 75 cm or more depending upon soil type and prevailing wind condition, grouted with cement concrete mixture of 1 :2:4 using grouted with cement concrete mixture of 1 :2:4 using telescopic insertion of column.
Suggested technical specifications of Naturally Ventilated Greenhouse
Size - As per requirement from 1000 to 4000 square meters
Bay size - 8m x 4m Ridge height 6.5m Ridge Vent 90 cm opening
Gutter height - 4 m from floor area
Gutter slope 2% slope need be provided in civil foundation work
Gutter material 20 gauge or 1/1.2 mm thick GI sheet with perimeter of 500 mm or more preferably of single length without joint
Structural designs : The structural design need to be sound enough to withstand wind speed minimum 150 km/hr and minimum load of 25 kg/m2
Complete structure made of galvanized steel tubular pipes or equivalent section Conforming Indian Standards having wall thickness 2mm, structural member should be joined with fasteners properly.
Columns 76 mm OD, 2 mm/2.9 mm thickness
Trusses Bottom 60 mm OD, 2/2.9 mm thickness
Top Arches 42 mm OD 2/2.6 mm thickness
Trusses member 42 mm/32 mm OD, 2/2.6 mm thickness
Purlin 42 mm OD, 2/2.6 mm thickness
Purlin member & others 33/25 mm, 2/2.3 mm thickness
Fasteners All nuts & bolts must be of high tensile strength and galvanized.
Entrance room & Door : One entrance room of size 3 m x 3 m x 3 m (L x W x H) need to be provided and covered with 200 micron UV stabilized transparent plastic film. 200 micron UV stabilized transparent plastic film. Two hinge doors of size 2 m width.
Cladding material :
UV stabilized 200 micron transparent Plastics films conforming Indian Standards (IS 15827: 2009), multilayered, anti drip, anti fog, anti sulphur, diffused, clear and having minimum 85% level of light transmittance.
Fixing of All ends/joints of plastic film shall be fixed with two way aluminum or GI profiles
Spring Insert Zigzag high carbon steel with spring action wire of 2.4 mm diameter must be inserted to fix shade net into Profile.
Curtains and insect screen
Roll up UV stabilized 200 micron transparent plastic film as curtains need be provided up to 3.0 m height on all sides Manual opening and closing of curtains shall be provided.
40 mesh nylon insect proof nets (UV stabilized) of equivalent size need to be fixed inside the curtains. Anti flapping strips is fixed to ensure smooth functioning of the curtain.
Sliding Shade net
UV stabilized 50% shading net manually operated mechanism for expanding and retracting.
Drip Irrigation System with fogging & misting facility
Drip irrigation system under greenhouse need to be selected on the basis of crop spacing (design on selected on the basis of crop spacing (design on spacing 45cm x 45 cm) along with fogging and misting facilities. The spacing considered for calculation The suggested bill of materials are Sand Filter 5 m3/hr, Screen Filter 10 m3/hr, Control Valve 1.5", Air Release Valve 1 ", Non Return Valve 1.5", 63 mm, Control Valve 50mm, By-pass Assembly Throttle Valve 1.5", Flush Valve 50mm, Venturi1.5" Assembly with manifold, PVC pipe 63 mm/6 kg cm2, PVC pipe 50 mm/6 kg/cm2, PE plane lateral 16 mm, Emitting pipe lateral 16mm-@ 0.45m spacing, hanging type micro sprinkler nozzle .